Rotary engine.



110. 761,512. PATENTED MAY 31, 1904.

P. LBGOMTE.

ROTARY ENGINE.

APPLICATION FILED APR. 27. 1903.

N0 MODEL. 2 SHEETS-SHEET 1.

BEST AVNLABLE CO No. 761,512. v PATBNTED MAY 31, 1904. P. LEGOMTE. ROTARY ENGINE.

APPLICATION FILED APR. 27. 1903. R0 MODFLv 2 SHEETS-SHEET 2.

u wea -M n,

removed for the purpose of showing the ar- BEST'AVAILABLE COP.

Patented May 31 904.

UNITED STATES PATENT OFFICE.

PRETEXTAT LECOMTE, OF CONSTANTINOPLE, TURKEY, ASSIGNOR oE ONE-HALF TO LEWIS F. .MIZZI, OF OONSTANTINOPLE, TURKEY.

ROTARY SPECIFICATION forming part of Letters Patent N0. 761,512, dated May 31, 1904.

Application filed April 27, 1902.

To all whom it may concern.-

Be it known that I, Pnnrnx'rx'r LEOOMTE, a citizen of the Republic ofFrance, residing at Constantinople, Turkey, have invented cer tain new and useful Improvements in or Relating to Rotary Motors,.Pumps, or Engines, of which the following is a specification.

This invention relates to a rotary motor, pump, or engine the essential elements of which may be combined in such manner that it will work either with single or double expansion, each of the said elements comprising chiefly a cylinder with two covers, between which rotates a disk constituting, in combination with blades or ribs transversely movable in it, the piston for the said cylinder. The lateral edges of the said'blades cooperate with the corresponding faces of the cylindercovers, which are provided with symmetrical helical surfaces extending in opposite directions, said helical surfaces being separated by flat surfaces, at each side of which are respectively the inlet and exhaust openings merging into recesses in the said cam-surfaces. I Admission and exhaust take place without the aid of any intermediate accessory parts, simply by the transverse shifting of the blades, which takes/place under the influence of the rotation of the piston, the lateral edges of said blades always remaining in contact with the corresponding surfaces of the cylindercovers and bringing about the expansionof the driving fluid at a mom nt comprised be tween the closing of the inlet and the opening of the exhaust. This construction may be used not only as motor, but also as a suctionpump or high-pressure fan for blast-furnaces and other purposes.

A rotary motor according to this in ation, with two cylinders combined to obtain double expansionof the driving fluid, is illustrated, by way of example, in the accompanying drawings, in which I Figure l is a View in elevation in longitudinal section through the axis of the small cylinder, the walls of the large cylinder being rangement of the parts in the interior thereof. Fig. 2 is a plan of Fig. 1, the upper perthis motor.

construction of both.

Serial No. 154,533. (No model.)

the piston and covers of the large cylinder of,

Fig. 7 shows diagrammatically in development the position of the cylindercovers and piston and illustrates the process of admission, expansion, and exhaust. v

The two elements of this motor in which the fluid can simultaneously work at diflerent pressures being similar except as regards their dimensions, it will be suflicient to describe one of them in order to understand the Each of the said elements is mainly constituted by a cylindrical body consisting of two half-cylinders a. 5 bolted together. The cylinder thus constituted is closed by covers 0 (Z, bolted to the corresponding flanges of the half-cylinders a Z).

Each cover 0 (Z has on its inner face two helical surfaces 6 f, which start from a projecting segmental flat surface g and extend therefrom in opposite directions and terminate at a segmental flat surface It identical with and diametrically opposite to the first one, g, but lying in a different plane and in intaglio in the corresponding cover 0 or d.

The covers 0 and (Z are arrangedon the cylinder in such a manner that their respective plane surfaces g and I1. face each other and in such manner that the interval between the said plane surfaces and the corresponding helical surfaces is constituted by a space limited by surfaces sometimes plane and sometimes helical, but always parallel to each other.

The covers a and d are further provided with circumferential recesses u '0, cut oneach side of the projecting flat surfaces g .within the width of the helical surfaces 0 f. These grooves have the shape of curved wedges by means of which the interior of the cylinder communicates with the exterior by orifices in which terminate at the orifices of the recesses. 14 the inlet-pipes m for the fluid under pressure and at the orifices of the recesses 'v the exhaust-pipes y for the same fluid after it has done its work.

The piston is constituted by a disk 10, havin g in its center two cylindrical projections t' i, fitting into corresponding recesses j j in the center of the corresponding covers d.

The piston p is mounted on a shaft k, passing through stuffing-boxes in the center of the covers 0 d. The thickness of the piston p is such that its parallel faces can freely rotate in the interval between the flat projecting surfaces 9, while fitting them exactly.

The disk 12 is provided with radial slots Z, extending from the cylindrical surface of the projections 45 to its circumference. slots Z are arranged blades m n 0, which can move in a direction parallel 'to the shaft k during the rotation of the piston. These blades m n o are constructed so that they can expand in the direction of their width, so that their opposite edges press against the surfaces of the covers 0 (1 during the rotation of the'pi'ston. For this purpose the blades are made of two similar plates 3 t, engaging with each other and capable of laterally sliding relatively to each-other in the thickness of the piston 17. These plates 8 t are provided with interior recesses q, intended to receive springs 9', which have the tendency to move them away from each other, and consequently to keep the opposite edges of the blades in contact with the covers 0d. These edges are pieferably'constituted by two bevelsurfaces, forming a hogs back and sloping in the direction corresponding to that of the helical surfaces 0 f for the purpose of causing them to cooperate efliciently with the said surfaces during the rotation of the piston.

In order to insure suflicient tightness of joint, two or three blades of the construction described may be used in each recess; but in that case they must be made of suitable thickness, and each blade then acts separately, pressing with its edge on the corresponding surface of the helical cam, so that obturation takes place on a wider'surface of the cam.

As already explained, the fluid is admitted at each side through the covers 0 d by means of the pipes :12, the exhaust taking place through the pipes 3 the orifices of these inlet and exhaust pipes being, respectively, diametrically opposite each other, so that the fluid acts simultaneously on each side of the piston, the operative area of the blades of the latter gradually increasing, as will be hereinafter explained.

The working of the motor is as follows: With reference to one side of the rotary piston v 9 let it be assumed that the piston rotates in the direction indicated by the arrows, Figs. 3 and 7, and that the fluid has entered the compartment limited by the blade m and that this blade has arrived at the bottom of the descending helical cam ethat is to say, at the intersection of this cam with the corresponding segmental flat surface h, Fig. 7. In that position the next blade 0 will already have entirely passed the inlet-recess u and cutoff the In these BEST AVAILABLE COP admission of the fluid. The latter will then be contained in a triangular compartment, the oblique and lateral walls of which will be constituted by invariable surfaces which will form a number of points of abutment for the fluid, and the base of which triangle will be .formed by a movable surface on which the fluid will exercise pressure. As the compartment occupied by the fluid will increase in volume, owing to the movement of the piston, the fluid will expand in that compartment limited by the blade on and at the same time exercise its driving action on the latter, thus causing the piston to rotate in the direction indicated. As soon as the blade m begins to move on the segmental surface it and the next following blade 0 hascompletely closed the admission of the fluid the preceding blade n begins to open the exhaust, so that to the expansive force of the fluid acting behind the blade on is added the action ofthe depression in the compartment in front in which the fluid acted previously, the working of the motor and the action of the fluid onthe blade on without back pressure being thus insured. The blade m, on having reached the end of its travel on the flat segmental surface It travels on the ascending helical surface f, carrying with it a certain quantity of inert fluid, the volume of which remains the same. This quantity escapes in its turn as soon as the blade m has uncovered the exhaust-orifice.

The same process as that described with reference to one side of the piston takes place on the other side of the piston, the two series of operations alternating with each other. It follows, therefore, that the driving fluid will be admitted and exercise its pressure during the whole time of its-admission to one side of this piston, the expansion of it taking place in one of the compartments on the other side, and vice versa.

It follows from the preceding explanations that the admission, expansion, and exhaust of the driving fluid take place without the intervention of any accessory parts and are effected by the simple action of the blades in cooperation with corresponding lateral surfaces of the cylinder-covers, the arrangement of these surfaces being such that the blades move transversely and alternately, so as to regulate all admission, expansion, and exhaust successively and alternately on each side of the piston carrying them. The expansion taking place in the small cylinderis not sufficiently complete to utilize the whole pressure of the fluid that passed through that cylinder, and the fluid on leaving that cylinder has sufficient force of expansion to enable it to act on driving-blades of larger area. This additional force of expansion may be utilized in the manner shown in the construction illustrated in the drawings, in which the fluid escaping from the small cylinder by the pipes y is admitted into the large cylinder at e a at each side of the piston 19 and escapes at w w after its pressure has been completely utilized in that cylinder. In this construction the pistons of both cylinders are keyed onto the same shaft, so that the motor thus acts like a reciprocating compound motor.

- What I claim as my invention, and desire to secure by Letters Patent, is

1. A rotary motor pump or engine comprising a cylindrical casing the lateral walls whereof are provided with helical cam-surfaces ef, diametrically opposite fiat segmental surfaces g it between said helical surfaces and wedgeshaped admission and exhaust recesses u 0 one at each edge of the raised segmental surface with their deepest parts against such edges, in combination with a radially-slotted disk 39 BEST AVAlLABLE GOP".

and a plurality of laterally-slidable and expansible piston-bearings m n 0 mounted in the slots, substantially as set forth.

2. In a rotary engine of the kind described, a piston-disk comprising a shaft, a circular disk fast thereon, circular central guide-boxes on either side of said disk and radial pistonblade slots extending from the outer edge of the disk to the central guide-boxes, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

PRETEXTAT LECOMTE.

Witnesses:

WM. THALAsso, M. GoLLAros. 

